Category Archives: Pistols

Polymer80 Glock Build Troubleshooting

If you haven’t heard about Polymer80, they make a number of 80% receivers including some remarkable Glock compatible frames. Now they aren’t just a cheap gimmick – I like the grip angle, the texture and the finger relief that all result in a far better feeling pistol than an actual Glock in my opinion. Now there are haters that say these are not Glocks – that’s fine, they aren’t. Then again, it’s not like we all buy ARs only made by Colt or Armalite either in comparison.

So I have been posting about how to do the builds [Click here for a Glock 17 using the PF940V2 frame post and here for one on Glock 19 using the PF940C frame post]. They are very straight forward, fun and can generate a reliable pistol. Like all things, there can be challenges and troubleshooting your build to understand why the slide is binding, the trigger isn’t resetting and so forth are all things that may happen. Luckily, there are also lots of videos and posts for understanding how to solve the challenges.

Be Sure to Read the Instructions First

I do recommend you read the instructions from Polymer80 before you do your build. If you didn’t read them and are now having challenges, I would recommend you go back and read the good instruction file they wrote and watch the video:

Troubleshooting Videos



Also, Pew Pew Tactical did a nice series of posts on building and troubleshooting Polymer80 builds. Click here to open a new tab and go there.

My Take On Common Issues

  • The slide doesn’t go all the way back: Check that the recoil spring is not catching on the channel you needed to mill out. Check that the slide stop spring is sitting flush and not catching on the spring. Sometimes plastic falls into that channel and keeps it from fully seating. (It would be a good idea to blow your frame out with compressed air to get all the loose plastic out).
  • Trigger not resetting – this is either an issue with how Polymer80 did some of the Rear Rail Modules (RRMs) or how the frame was drilled causing the RRM to move. If this happens, you will need to file a bit off the right side (when looking down at the receiver) of the RRM so the trigger bar doesn’t hit it. I’d also recommend checking that there aren’t burs/machining imperfections on any of the trigger’s metal parts that might cause binding.
  • Slide not cycling smoothly – The rail modules should be equal height. Again, there may have been an issue with drilling causing an alignment issue. See if you can bend/adjust the rail modules so they line up.
  • Trigger feels gritty – remove the trigger and polish all metal surfaces. Blow out the pistol and trigger areas to ensure there isn’t any plastic debris. Expect it to take a couple hundred rounds to smooth out.
  • Action feels gritting – again, polish everything. I like the small rubberized polishing bits for the Dremel as well as working with sandpaper up to 2000 grit. Always remember that your goal is to smooth and polish, not to remove a ton of material.

So, I hope this helps you out. Polymer80 Glock frames are well engineered and do work. There may be some issues you need to work through due to how you build the pistol and the parts you use but view overcoming them as part of your journey and don’t give up. The end result is definitely work it.


If you find this post useful, please either buy something using one of the links to eBay and Amazon. With Amazon, if you click on one of our links and then buy something else – even unrelated stuff like clothes, electronics and groceries – we get credit and it would be hugely appreciated. Doing something like the above will help us fund continued development of the blog.


Please note that any images shown were extracted from the videos and remain the property of their respective owner(s).


Extended Magwell for Polymer 80 Glock Frame

$20.00
End Date: Sunday Mar-3-2019 13:44:52 PST
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Steel City Arsenal Slim magwell for Polymer 80 PF940C Frames

$74.99
End Date: Tuesday Mar-19-2019 11:20:49 PDT
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AlphaWolf Slide for Glock 21 Polymer80 Gen 3 w/ Dovetail and OEM Rear Serrations

$199.95
End Date: Monday Feb-25-2019 5:07:16 PST
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Cain Arms Compact Magwell Fits Polymer80 PF940C Glock 19 23 Frames USA Made

$16.99
End Date: Sunday Mar-17-2019 17:14:23 PDT
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Steel City Arsenal [UltraLight] slide for Glock 26 gen 3/4 or Polymer 80 PF940SC

$279.99
End Date: Friday Mar-22-2019 15:42:03 PDT
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Extended Magwell for Polymer 80 Glock Frame

$22.00
End Date: Sunday Mar-3-2019 13:44:52 PST
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Custom Slide - For Glock 19 GEN 1,2,3, & Polymer80 Stainless Steel - BRAND NEW

$155.00
End Date: Thursday Mar-7-2019 14:31:33 PST
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New Polymer 80 PF940 GEN1 System in Black

$140.00
End Date: Sunday Mar-24-2019 19:51:46 PDT
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Cain Arms Compact Long Magwell Fits Polymer80 PF940CL Glock 19 23 Frame USA Made

$16.99
End Date: Tuesday Mar-5-2019 8:07:29 PST
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Steel City Arsenal Slim magwell Specifically for Polymer 80 PF940V2 Frames Black

$74.99
End Date: Tuesday Mar-19-2019 11:20:49 PDT
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Two Videos On Preparing Polymer80 PF940C Glock 19 Frames For Use

If you haven’t heard about Polymer80, they have come out with a really straight forward way to make a pistol using Glock parts. You aren’t going to really save money but you are going to have a very cool end result that you can customize however you want.

In surfing around, I came across two videos that have some pretty good camera angles and commentary about guys drilling the holes and filing down the frames that I thought I would share:


Polymer80 is offering some really innovative products. These are not hacks by any means. I like the grip angle, the texture and the finger groove built into the trigger guard. The whole concept is well executed for guys who like building their own firearms.

Note, Polymer80 products are being sold by a ton of vendors so shop around and watch for sales.

Also, be sure to download and read their instructions. They are well illustrated and have pretty good detail.


If you find this post useful, please either buy something using one of the links to eBay and Amazon. With Amazon, if you click on one of our links and then buy something else – even unrelated stuff like clothes, electronics and groceries – we get credit and it would be hugely appreciated. Doing something like the above will help us fund continued development of the blog.


Please note that any images shown were extracted from the videos and remain the property of their respective owner(s).


Extended Magwell for Polymer 80 Glock Frame

$20.00
End Date: Sunday Mar-3-2019 13:44:52 PST
Buy It Now for only: $20.00
Buy It Now | Add to watch list

Steel City Arsenal Slim magwell for Polymer 80 PF940C Frames

$74.99
End Date: Tuesday Mar-19-2019 11:20:49 PDT
Buy It Now for only: $74.99
Buy It Now | Add to watch list

AlphaWolf Slide for Glock 21 Polymer80 Gen 3 w/ Dovetail and OEM Rear Serrations

$199.95
End Date: Monday Feb-25-2019 5:07:16 PST
Buy It Now for only: $199.95
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Cain Arms Compact Magwell Fits Polymer80 PF940C Glock 19 23 Frames USA Made

$16.99
End Date: Sunday Mar-17-2019 17:14:23 PDT
Buy It Now for only: $16.99
Buy It Now | Add to watch list

Steel City Arsenal [UltraLight] slide for Glock 26 gen 3/4 or Polymer 80 PF940SC

$279.99
End Date: Friday Mar-22-2019 15:42:03 PDT
Buy It Now for only: $279.99
Buy It Now | Add to watch list

Extended Magwell for Polymer 80 Glock Frame

$22.00
End Date: Sunday Mar-3-2019 13:44:52 PST
Buy It Now for only: $22.00
Buy It Now | Add to watch list

Custom Slide - For Glock 19 GEN 1,2,3, & Polymer80 Stainless Steel - BRAND NEW

$155.00
End Date: Thursday Mar-7-2019 14:31:33 PST
Buy It Now for only: $155.00
Buy It Now | Add to watch list

New Polymer 80 PF940 GEN1 System in Black

$140.00
End Date: Sunday Mar-24-2019 19:51:46 PDT
Buy It Now for only: $140.00
Buy It Now | Add to watch list

Cain Arms Compact Long Magwell Fits Polymer80 PF940CL Glock 19 23 Frame USA Made

$16.99
End Date: Tuesday Mar-5-2019 8:07:29 PST
Buy It Now for only: $16.99
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Steel City Arsenal Slim magwell Specifically for Polymer 80 PF940V2 Frames Black

$74.99
End Date: Tuesday Mar-19-2019 11:20:49 PDT
Buy It Now for only: $74.99
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Great video on Doing a Polymer 80 Pf940V2 Glock Build

In the previous post, I told you about my finding Gunstreamer for firearms videos. What brought me there was that I was searching on Google for Polymer80 build videos.

On Gunstreamer I found this great video of a guy, who is obviously experienced in building Glock pistols, showing a build on a Polymer 80 Pf940V2 80% frame. He steps you through what needs to be done in terms of sanding, filing and drilling with the supplied jig and then he goes on to actually assembling the pistol.

I learned a lot watching the video – he has a solid informative style and shows you what he is doing.

Here’s the Video


If you find this post useful, please either buy something using one of the links to eBay and Amazon. With Amazon, if you click on one of our links and then buy something else – even unrelated stuff like clothes, electronics and groceries – we get credit and it would be hugely appreciated. Doing something like the above will help us fund continued development of the blog.


Please note that all images were extracted from the video and remain the property of their respective owner(s).


GLOCK OEM Extended Slide Stop Release 3 Pin 17 19 22 23 26 27 31 32 34 - SP07496

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Glock OEM Smooth Drop-in Trigger w/ Bar Assembly Gen 1 2 3 4 9mm,40,357 SP00357

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Glock Extended Magazine Release Mag Catch Gen 1, 2, 3 9mm / 40 / 357 SP01981 OEM

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GLOCK OEM Factory Guide Rod Recoil Spring Assembly Glock 17 22 24 31 34 SP01533

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GLOCK OEM Factory Guide Rod Recoil Spring Assembly Gen 3 Glock 19 23 32 SP02457

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Improving the Feed Reliability of the Rock Island 52000 10mm 6″ High Cap Pro Match Pistol

As some of you may know from a previous post I did, my Big Rock would not feed Underwood 10mm ammo.  Neither Armscor/Rock Island nor Underwood helped resolve my issue though Armscor did take the pistol back and tell me there was nothing wrong with it – probably with FMJ ball ammo.

At any rate, the solution came from a discussion with my friend and FFL, Scott Igert, of Modern Antique Firearms, about the mechanics of the 1911.  A lot has to come together correctly for a 1911 pistol to work correctly.  In watching the pistol jam, I could see that it always hung on the pronounced shoulder edge of the Underwood 10mm ammo right on the edge of the chamber.

Any 10mm ammo that did not have that pronounced shoulder fed just fine.  In doing some digging, I elected to do two things.

First, I polished the feed ramp.  To do this, I fieldstripped the Big Rock and removed the barrel for easy access.

I then used my cordless Dremel with with a felt bob and Flitz polish to give the feed ramp a mirror polish.

Second, I used one of the fine rubber POLISHING tips in my Dremel to polish the edge all the way around the chamber.  To be clear, I am talking about light polishing and not removing a ton of material.  Do not use a sanding wheel or you may take off too much material in the blink of an eye.  Take your time and be patient.  My goal was to enable the 10mm case’s shoulder to slide over and into the chamber vs. hanging.  My recommendation is to always go light, test and repeat as needed.

After the polishing, I then used some of the big 10mm cleaning Q-Tips called “RamRodz” repeatedly along with visual inspection to make sure all the grit was gone and not mess up the testing.  Yeah –the RamRodz look goofy because they are huge and caliber-specific but they sure make cleaning easy.

For me, it just took one try – even I was surprised.  Whatever the case was catching on was either gone or rounded over.  The feed problem was solved – round after round cycled perfectly with no more jamming.

A few months after this I decided to sell the Big Rock to move on to other projects.  I can’t say that Armscor’s support impressed me given I had one of their top of the line pistols.  I gave them a very elaborate explanation of what was happening and they did not resolve the problem whereas a good talk with someone with a lot of 1911 knowledge, Scott, did.  It definitely shows there are benefits to having a smart friend.

In closing, I will go back to a recommendation I always make.  Before you rely on a pistol, definitely practice with the ammo you plan to use to make sure everything works the way you want.  The Big Rock liked S&B FMJ, SIG HPs and further crimped Underwoods from Scott but not the factory-direct Underwood 10mm ammo until I did the above tuning.


 

If you find this post useful, please either buy something using one of the links to eBay and Amazon to buy something.   With Amazon, if you click on one of our links and then buy something else – even unrelated stuff like clothes, electronics and groceries – we get credit and it would be hugely appreciated.  Doing something like the above will help us fund continued development of the blog.


 

The Dan Wesson Bruin and RIA Big Rock Meet – Side By Side Photos

I am still trying to sort out which of the 10mm pistols to keep. The Dan Wesson Bruin is refined and functions beautifully but only holds 8 rounds. The Rock Island Armory (RIA) 52000  10mm ” Pro Match HC “Big Rock is not as smooth and doesn’t like all ammo but it holds 16+1 rounds, has a bull barrel and ought to smooth out the more it is fired. I suppose I am leaning towards the Big Rock right now but haven’t decided for sure.In the mean time, I thought you might like to see the two pistols in more of a side-by-side manner for comparison.


If you find this post useful, please either buy something using one of the links to eBay and Amazon to buy something.   With Amazon, if you click on one of our links and then buy something else – even unrelated stuff like clothes, electronics and groceries – we get credit and it would be hugely appreciated.  Doing something like the above will help us fund continued development of the blog.


Upgrading the Big Rock’s Sights With Help From Scott Igert of Modern Antique Firearms

The Rock Island Armory Model 52000 Pro Match Ultra 6″ – 10mm pistol is affectionately known as the “Big Rock” to folks who own one.  When I got mine, one of the few things I wanted to improve were the sights. The front fiber optic segment was a dim red and the back white dots were just paint.  When I’d sight down the pistol, the sights didn’t really “jump” out and catch my eye the way I would like.

 

Scott Igert, owns Modern Antique Firearms, in Benton Harbor, MI, and is a good friend of mine. I told him about the sights because I knew he could upgrade them to be more visible. So, one day I ook the pistol to his shop and and snapped some photos while he worked his magic.  Now Scott does this all the time so he has all the supplies on hand and knows exactly what to do, which was real obvious as I watched and he explained what he was doing.

First up was to replace the front fiber segment. He showed me how the fiber is held in place by flared ends that were created by heating the fiber.  He simply snipped the fiber in the middle being careful not to hurt the rest of the sight that held it in place and then just pulled it out.

Next, we talked about the color of fiber I wanted and it was bright orange. He had these big lengths of fiber in different colors and diameters that he picked through to get the one that would fit the Big Rock, cut it longer than needed and scraped it until the outside diameter was such that it could slide into the old sight base’s holders for the fiber.

Scott gave the fiber segment a quick spritz of weapons oil to get it to slide into the holder. He then trimmed the fiber so there was still enough protruding to melt into the bulged shape needed to secure the fiber in place. With that, the front was done.

For the rear, he selected a very eye catching yellow paint to fill the two round depressions that were painted white. He used a small rod to apply the paint and a business card to wipe away the excess and let it dry.

Wow – what a difference now. The combination is eye catching and a huge improvement.  I’ll need to get an after picture that does the new sight justice.  If you are disappointed with your pistol sights, definitely contact Scott.


If you find this post useful, please either buy something using one of the links to eBay and Amazon to buy something.   With Amazon, if you click on one of our links and then buy something else – even unrelated stuff like clothes, electronics and groceries – we get credit and it would be hugely appreciated.  Doing something like the above will help us fund continued development of the blog.


Dan Wesson Bruin First Look – A 6″ 10mm Refined Power House

As part of my foray into 10mm pistols, I picked up a Dan Wesson Bruin with the help of Scott Igert of Modern Antique Firearms.  The Bruin intriqued me based on reviews and that this was a Dan Wesson pistol!  I have liked Dan Wessons since the days they made the revolvers with exchangeable barrels.  Not too long go they were acquired by CZ  but the quality is still there based on everything I have heard.  I sure liked their Titan but at $4-4,200, it was way, way outside my price range compared to the $1,800 Bruin.

Now I bought the Model 1880 10mm Bronze Bruin before my Big Rock because we found it first and the more I read, the more I wanted to get one.  In my opinion it is excellently built. Here are the off-the-shelf specs:

  • Magazine Capacity:  8 rounds
  • Frame:  Forged Stainless
  • Overall Length:  9.7″
  • Barrel Length:  6.03″
  • Width:  1.5″
  • Weight:  2.74 pounds
  • Trigger:  Single Action
  • Front Sight:  Tritium Fiber Optic
  • Rear Sight:  Adjustable Night Sights

When the pistol arrived, Scott, his cousin Andrew and myself were all very impressed. It was coated in a ton of oil in a bag but the first thing we all noticed was how smooth it was – no grittiness anywhere. She slide and trigger were all so slick.  The trigger is probably the best feeling of any pistol I own.

I field stripped the Bruin, wiped off the packing oil, lubricated it and took the pistol to the range. It shot like a dream. No problems of any kind with 180 grain S&B FMJ loads or either 155gr or 180gr JHP loads from Underwood. The Bruin handled everything smooth as silk and its weight really made recoil a non-issue. It’s there but it’s not a big deal is how I would describe it.  Normally my carpal tunnel will act up and tell me when recoil is too much but I really just had fun.  I’m so used to having to fiddle with guns that when one works just the way it should out of the box, it is a real treat.

Given the magazine capacity, I went ahead and bought two more magazines giving me a total of four mags. Interestingly, the website said they were out of stock but when I called their parts department they said they did have them and the gentleman I talked to mentioned that the website quantity onhand vs. actual wasn’t that reliable.  So if you need mags, call them.  Don’t just go by the website plus they have mags both with and without the rubber bumpter. I like the bumpers personally – they add a bit of weight to help the empty mags drop plus help protect the floor plate when they hit the ground.

One little detail I really like is the extended slide release lever.  It has a little extended shelf that gives you a tad bit more leverage to push down and release the slide despite the heavy recoil spring.

Obviously I am  a big fan of this pistol.  I do have one con to mention – the Bruin has a distinctive angled front barrel plug that makes field stripping a bit tricky as you try and get things lined up. To be honest, I would chuck that angle and field stripping would become much easier.  That is my only complaint.

At this point I am debating whether to keep the Bruin, the Big Rock or both,  It may take me a while to decide 🙂  The Big Rock is a wicked brute and the Bruin is very refined.  Both are better pistols than I am a shooter so more thinking is required. In the mean time here are some photos:


If you find this post useful, please either buy something using one of the links to eBay and Amazon to buy something.   With Amazon, if you click on one of our links and then buy something else – even unrelated stuff like clothes, electronics and groceries – we get credit and it would be hugely appreciated.  Doing something like the above will help us fund continued development of the blog.


Rock Island 52000 10mm 6″ High Cap Pro Match Pistol – First Impressions of the Big Rock

I must admit I have a fascination with the 10mm auto cartridge.  First, it has cool ballistics. Second, it can be found in a number of semiauto pistol platforms including my favorite 1911/2011 platform.  Third, I’ve wanted one since Miami Vice in the 1980s 🙂  Honestly, it is the first two reasons – the ballistics of the 10mm are pretty amazing and I wanted something in a 1911/2011 style pistol.

While some folks were reading the blog post, they pointed out a common misconception that the 10mm and .41 magnum are similar when, in fact, they are not.  I went over to gunnersden.com and grabbed some data from their ballistics table for pistol cartridges to show the 10mm compared to the .40, .41 magnum and .45 ACP.

 

Over the past year, Scott Igert, of Modern Antique Firearms, has helped me track down two 10mm pistols that I want to share with you including the Rock Island 52000 6″ Pro Match Ultra (some call it the “Big Rock”) and the Dan Wesson 6″ Bruin.  In this post, I’ll focus on the Big Rock.

My first choice was a STI Perfect 10 but they had stopped the 10mm model I wanted in 2016.  I wasn’t too keen in buying an out of production model so I continued digging around and wound up reading about the Big Rock. Now I realize you can’t compare STI and RIA pistols so let’s just shelf that right up front.  What did intrigue me about the Big Rock were very good reviews and a very affordable price point for a true double stack 16+1 10mm pistol with a 6″ match barrel.

In case you aren’t that familiar with RIA pistols, they are made by Armscor of the Philippines. Armscor is the biggest producer of 1911 style pistols in the world including making pistols for Auto-Ordnance, High Standard and even the STI Spartan. These folks know their way around a 1911 and the Philippines has a big time gun cultuure either equal to  the US or only second to the US.

While their manufacturing has traditionally been in the Philippines, my understanding is that some production may be moving to the US, but the Big Rock I bought was made in the Philippines by gunsmiths in their Medallion custom shop.  The Medallion gunsmiths hand select and assemble each pistol resulting in a pretty solid pistol with an excellent prive:value combination.

Now, value really depends on the customer – either me or you.  So let me tell you key features that mattered to me:

  • 4140 Ordnance Steel that is CNC machined – folks, read up on the first batches of 10mm pistols including the Deltas. They would shoot themselves loose.  Metallurgy has come a long way.  I read good reports of the fitment and functioning before I bought the pistol and mine arrived snugly assembled. I loathe loose slides and barrels – the Big Rock is solid.
  • 2.5 pounds unloaded and 2.9 pounds loaded – I wanted it to soak up the recoil of the pistol plus heavier pistols always work in my favor when it comes to dampening my tremor.
  • 16+1 rounds – because you don’t buy toilet paper a square at a time 🙂  Seriously, I prefer more ammo and I like thicker grips. Years ago I had a Desert Eagle .44 Mk.V and loved the feel. This is the same way.  I wear XL-sized gloves due to big palms and relatively short fingers. I really like the feel of the 2011 family. In the event I were to ever use this pistol in a self-defense situation, I would prefer the extra rounds.
  • On a related note, the pistol has G11 grip panels that aren’t overly aggressive cut. G11 is basically a family of epoxy refinforced fiberglass laminates. They are strong, durable and aren’t going to split, warp, or wear like wood.  Havin worked with it on knives, I knew this would be a solid route to go. My first preference in a 1911 single stack are the rubber Hogue grips but he Big Rock’s grip would be too big for me.  I didn’t even try changing the G11 panels out once I received it. The big frame and these G11 panels work well together,
  • 6″ bull barrel with 6 grooves, a 1:16 twist and integral feed ramp – this barrel will be more accurate than I ever will be. I liked the fact it did not use a bushing, that the feed ramp was there and it had the right twist rate for 10mm.  As an aside, I went with the 6″ barrel because this will be a range or hunting pistol. If I wanted something for carry or duty, I would have gone with the RIA Tac Ultra FS (Full Size). RIA also makes a Tac Ultra MS (Mid-Size) with a 4.25″ barrel.  You’ll notice I didn’t mention Glock or SIG and that’s just because I wanted a 1911/2011.
  • Adjustable trigger pull from 4-6 pounds and adjustable over travel – I am a trigger snob. The Big Rock’s trigger is pretty decent but the trigger on my Dan Wesson Bruin is fantastic. When I have time, I want to dial the pull down some. The over travel is set right I just wish it broke a bit lighter, It’s a tad gritty but I expect that to wear in and smooth out as the parts get to know each other.
  • Fiber optic front sight and adjustable LPA-TRT rear sight – as I get older, I find simplicity more and more appealing. The problem with optics is that they break, the point of impact shifts, batteries die, you have to fumble to turn them on in a high-stress situation, etc. I wanted good reliable sights. Now I will tell you the front fiber optic sight was too dark for me out of the box and I had Scott work his magic on upgrading the sights but that’s a story for another time.
  • Picatinny Rail – on pistols that I may use for self defense, I like to mount a true weapon light and laser. The Big Rock has a nice long steel rail to do whatever you want. I mounted a Streamlight TLR-2 HL G, which is a reliable 800 lumen light with an integral green laser.  I’ll tell you more about that in a future post.
  • Magazine funnel – when I am in a rush, I want a nice big magazine well to shove the next mag into.  I find them more forgiving and faster than having to slam a magazine into a tiny opening.The Big Rock comes with a nice big funnel already installed
  • Parkerized finish – I do manganese parkerizing and like the dull black look. Keep it oiled and you are good to go. Note, Parkerizing isn’t a rust proofing – it modifies the surface layer of steel allowing for other things to get a good hold. For example, parkerizing and grease, parkerizing and cosmoline or parkerizing and then a weapons finish such as Molyresin.

Now you notice I didn’t list the dimensions as important considerations and that was because I didn’t really care how long (9.75″), wide (1.41″) or tall (5.5″) the pistol was. If these are important to you, great – they just weren’t important to me when I bought this pistol.

In buying this pistol, it was not easy to find and required some serious online hunting at Able, Buds, etc.  Honestly, the biggest problem with the Big Rock is finding a dealer that has it in stock. Scott was looking for me and I also had a number of automated searches set up on GunBroker and finally one showed up for sale by Elk County Arms & Ammo of St. Mary’s,PA, for $1,2339.49 out the door. These folks were professional and a delight to deal with. They promptly processed Scott’s FFL information and shipped the pistol just a few days later.  If you see something listed by them on Gunbroker you’ll notice a ton of positive reviews and one of them is mine!

To break the pistol in, I bought 500 rounds of S&B 180 grain FMJ and then Underwood 155gr XTP and 180gr bonded jacketed HP ammo. I also bought three more magazines direct from Armscor’s website.  I had to call them and confirm the magazine so here’s the link if you want to do the same.

So, the pistol comes seriously covered in oil. WhenI was taking it out of the bag,I couldbn’t help but think “Wow – this is awesome!”  Getting ready to go to the range, I field stripped it, cleaned the barrel and lubed everything just like I would any other 1911 with the exception that you have to unscrew the guide rod and there is no bushing to deal with.

We set up the target and the pistol functioned great with the S&B 180gr FMJ rounds. With the Underwood, things got ugly fast. Literally every 3rd to 5th round the pistol would fail to feed (ejection was fine but not feeding). This happened regardless of magazine or Underwood load.

So, I took it home and contacted Underwood and they questioned the recoil spring. I bought  Wolff 22# spring and started monkeying around with stripping the frame further and got the mainspring and trigger jammed – this was totally my fault and I decided to have Scott send it back to RIA to fix both my mistake and to check about feeding HP ammo. I was fully prepared to pay them for my mistake but they took care of everything in about 2-3 weeks and sent the pistol back to Scott noting that they could find nothing wrong with the pistol that would affect its ability to handle JHP ammo.

Now Scott is a good friend of mine and has been around guns and reloading his whole life plus is a career police officer so he is very pargmatic about everything.  Scott was also intrigued about what was going on with the Big Rock and took a closer look at the Underwood Ammo. He noticed there was quite a lip at the top of the case and that almost all the Underwood ejected cases had a scrape/gouge created during feeding, He then speculated that the match chamber of the Big Rock probably needed a more of a taper whereas the Underwood ammo was all straight. The next photo shows the scrape and gouge in one example Underwood round:

Scott took home a box of the Underwood ammo and put a slight taper on all and I met him the next day with my pistol – they all fed. We also took a box of SIG V-Crown 180gr JHPs which came from SIG with a visible taper and they fed just fine as well.  In the next photo, the Underwood round is on the left and the SIG is on the right – you can see the difference!

I contacted Underwood and told them about my findings and was a bit disappointed that they blamed the pistol and did nothing to compensate me for all the hassle – heck, I would have been happy to get a couple of more boxes of ammo from them. By the way, my 10mm Bruin feeds the Underwood ammo no problem so the issue is with that particular pistol and ammo combination.  Underwood did say they would take my findings into consideration and potentially change their production method but it did not sound certain at all.  Bottom line, I will not be ordering more Underwood ammo for this pistol.

So, a very valuable lesson was reinforced again — it pays to test ammo and find what is reliable in your pistol.  As the saying goes, practice, practice, practice.  Scott is going to take the balance of my 500 rounds of Underwood ammo and put a taper on them so I am not out my investment plus make me some ammo.  I’m also going to finally get into reloading myself based on his recommendations plus will contact some of the other ammo companies to find out who else tapers their ammo just in case.


April 2018 Update:  I did resolve this reliability problem with Underwood Ammo in the Big RockClick here to learn how.


The Big Rock is a very cool pistol and I am impressed. Their customer service also was a very pleasant surprise — I would have been more impressed if they had resolved the problem.  My problems were just with the Underwood ammo but others do not report this problem so it was a case where the pistol and ammo didn’t work together and this does happen.   A ton of people read this post so I want to be candid with you  so you can learn from what I experienced.  I’ve sold the pistol as it was interesting for a time but decided to move on to other projects.


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